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David Miliband is to step down as an MP, it is reported Credit: Daniel Hambury/PA Archive/Press Association Images

The brother of Doncaster North MP Ed Miliband is to step down as an MP to take up a charity role in New York, it was reported tonight. The former foreign secretary, David Miliband, who went to school in Leeds will announce the move tomorrow, the Daily Mirror said.

There had been widespread rumours that he was set for a return to the opposition front bench, with his sibling insisting recently that "the door is open". But instead he is expected to quit UK politics altogether, triggering a by-election in his South Shields seat.